one fraction simulation-free treatment with ct-guided stereotactic adaptive radiotherapy for patients with oligometastatic and primary lung tumors

Conditions: Lung Cancer; Oligometastatic Lung Tumor

Summary: stereotactic body radiotherapy (sbrt) has become a standard of care for medically inoperable or high-risk operable early-stage non-small cell lung cancer (nsclc) patients. it is also increasingly used to treat lung metastases in patients with oligometastatic disease. while sbrt is a powerful tool for the treatment of lung tumors, access to specialized treatment can be limited for patients who live far away from a treatment center. geographic accessibility can be limiting even for patients receiving one fraction lung sbrt, as the typical consult, ct simulation, and one-fraction treatment workflow is typically at least two to three weeks from start to finish, with a minimum of three in-person appointments. in this study, a high-quality cone beam ct (cbct) on-board imaging platform (hypersight; varian medical systems, palo alto, ca) will be coupled with advanced motion management and treatment techniques as well as ethos (varian medical systems, palo alto, ca) daily online adaptation to simulation-free workflow for one fraction sbrt. this has the potential to reduce the time it takes a patient to be cured of their lung tumor from two to three weeks to two to three hours. in this novel workflow, patients will undergo telephone/online consent followed by a diagnostic scan-based pre-plan for one fraction sbrt. on the morning of treatment, a brief follow-up appointment will be followed by treatment on the hypersight/ethos platform. patients will be treated using a simulation-free workflow. a hypersight thorax slow protocol cbct will be acquired for study purposes, and then the patient will be treated with online adaptive cbct-guided radiotherapy on the ethos/hypersight platform. treatment delivery will take place following contouring and treatment planning. patients will undergo standard of care simulation imaging in parallel for comparison. the purpose of this study is to evaluate the feasibility of a one fraction simulation-free treatment with ct-guided stereotactic adaptive radiotherapy for oligometastatic and primary lung tumors (one stop) workflow for patients with small, peripheral primary or oligometastatic lung tumors.


Eligibility criteria:
inclusion criteria: * one of the following diagnoses: * histologically or radiographically diagnosed stage i-iia (ajcc, 8th ed.) non-small cell lung cancer . * clinical ajcc stage i defined as stage 1a1 (t1a1n0m0, t1a tumor less than or equal to 1 cm), stage 1a2 (t1bn0m0, t1b tumor between 1 and 2 cm), and stage 1a3 (t1cn0m0, t1c tumor between 2 and 3 cm). * clinical ajcc stage ib defined as t2an0m0, t2a tumor between 3 and 4 cm. * clinical ajcc stage iia defined as t2bn0m0, t2b tumor between 4 and 5 cm. * oligometastatic lung tumor secondary to a primary cancer of any type/histology. oligometastatic patients may include patients with: * 1-5 sites of metastatic disease with at least one lung lesion intended to be treated with sbrt * more than 5 sites of metastatic disease with oligo-progressive disease in the lung intended to be treated with sbrt. * lesions must be small and peripheral. * small is defined as max tumor dimension of 5 cm or less. * peripheral is defined as greater than 2 cm from the proximal bronchial tree/mediastinum. * tumors and anatomy amenable to one-fraction lung sbrt confirmed by meeting of one-fraction lung sbrt target and constraint metrics on a diagnostic-scan based preplan. * patients who do not meet this criterion will be screen fails and triaged to the standard lung sbrt workflow and treated off trial. * lesions must have a maximum superior to inferior motion of 1 cm on 4d-ct imaging. * patients who do not meet this criteria will be screen fails and triaged to the standard lung sbrt workflow and treated off trial. * at least 18 years of age. * able to understand and willing to sign an irb approved written informed consent. exclusion criteria: * past history of radiotherapy within the projected treatment field of any of the disease sites to be treated by one stop sbrt. * pregnant and/or breastfeeding. patient must have a negative pregnancy test within 14 days of one stop sbrt.

Keywords: sbrt lung cancer oligometastatic cancer image-guided radiotherapy adaptive radiotherapy